Halo Reach Infection Map Zombie research Gameplay. View the Walkthrough here: www.youtube.com How to Download: (In Halo: Reach Main Menu) 1) Press Start. 2) Go to FILE BROWSER 3) Go to NEW CUSTOM SEARCH. 4) Go to FILE SHARE SEARCH. 5) Search for my Gamertag, “X Dom dot X” 6) Click on “Zombie Research” and choose DOWNLOAD. 7) (EXTRA Step) Download “H3 infection.”Game Type. The default “Infection” mode works pretty well with the map too.